BOSTON (AP) — Passengers on a whale watch boat are back on dry land after spending a long night stuck at sea outside Boston.

The boat got snagged by a lobster trap rope about 15 miles off Massachusetts on Monday. Divers managed to free it early Tuesday, and the vessel docked shortly before 8 a.m.

There were no injuries to any of the 157 passengers or six crewmembers.

Sheila Green, a spokeswoman for Boston Harbor Cruisers, says passengers were smiling and waving as the boat approached the dock.

Green says passengers will receive a refund on their $50 ticket, a $100 gift card for a future Boston Harbor Cruise and $500 cash for their troubles.

She said the passengers were given food and drink and blankets to stay warm.

The group was expecting only a three-hour tour but got much more after their boat was snagged by a lobster trap rope off Massachusetts and they were forced to spend a long night at sea.

The Boston Harbor Cruises whale watch vessel was freed early Tuesday and was undergoing a final inspection before being allowed to return to shore with its 157 passengers, the Coast Guard said.

One of the boat's propellers became entangled Monday on the rope about 15 miles offshore. Divers hired by the vessel's owner succeeded in freeing the boat, Coast Guard Petty Officer MyeongHi Clegg told the Associated Press.

"They were able to untangle the line from the propeller," said Clegg.

Ken Maguire, one of the passengers on the boat, said they had expected to be back Monday around 4:30 p.m. but about 10 minutes into the return trip, the boat stopped after apparently hitting something.

Whale watches are among the most popular tourist activities in the Boston area.